Machine for regrinding automobile crank shafts



F. H. PETERSEN AND .I. H. DARLING. MACHINE FOR REGRINDING AUTOMOBILECRANK SHAFTS.

APPLICATION FILED MAY 2. 192].

1,41 1, 181 Patented Mar. 28, 1922.

2 SHEEIS' SHEET 1-7 Patented Mar. 28, 1922.

2 SHEETSSHEET 2.

& m

fizz'enions F. H. PETERSEN AND 1. Hi DARLING.

MACHINE FOR REGRINDING AUTOMOBILE CRANK SHAFTS,

APPLICATION FILED MAY Z, 1921.

UNITED STATES PATENT OFFICE.

FRANK H. PETERSEN AND JAMES H. DARLING, OF DENVER, COLORADO, ASSIGNORSOF TWO THIRDS TO ALFRED S. WESTON, OF DENVER, COLORADO, AND ONE-THIRD TOSAID PETERSEN.

MACHINE FOR REGRINDING- AUTOMOBILE CRANK SHAFTS.

To all whom it may concern."

Be it known that we, FRANK H. PETER- SEN and JAMES H. DARLING, citizensof the United States of America, residin at the city and county ofDenver and tate of Colorado, have invented a new and useful Machine forRegrinding'Automobile Crank Shafts, of which the following is aspecification.

Our invention relates to improvements in machines for re-grindingautomobile crank shafts.

The object of the invention is to provide a machine comprising a poweroperated cutting or grinding rotary tool, and a support therefor whichis mounted in a pivoted slideway on the compound of a lathe carriage soas to have a reciprocating movement therein, one end of the supportbeing adapted to surround and to be secured upon either the crank pinsof a crank shaft or upon the bearin -supported portions of said shaft,to proper y position the grinder with respect to the pin or shaftportion being ground, the support remaining stationary when the shaft isground and having a reciprocating movement when a crank pin is beingground.

This object is accomplished by the mechanism illustrated in theaccompanying drawing, in which:

Figure 1 1s a side vlew showing the manner of operatively supporting themachine.

and-connecting it to a crank shaft which is centered in a lathe.

Figure 2 is a plan view of F i ure 1.

Figure 3 is aplan view of t e machine on a much larger scale.

Figure 4 is a side view of the same.

Figure 5 is a vertical sectional view on the line 5-5 of F igure4. I

Figure 6 is a sectional view on the line 66 of Figure 4.

Figure 7 is a' sectional view on the line 7-7 of Figure 4.

Figure 8 is a face view of a style of rotary grinder used in connectionwith the machine.

Figure 9 is a sectional view of Figure 8.

' Specification of Letters Patent. Patented Mar, 28 1922.

Application filed May 2, 1921.

Serial No. 465,965.

Figure 11 is a perspective view of a rotary cutter or millin tool, whichmay be used instead of the grinding tool, and,

Figure 12 is a sectional view through the, micrometer.

Referring to the accompanying draw- 1ngs:

The numeral 1, indicates the carriage of a common form of engine lathe,and 2, the usual compound which is adjustably mounted on the carriageand has a movement at right angles to that of the carriage. .Thecompound has a T-slot 3, in wh ch is mounted an ordinary slotted toolpost 4, and to the upper face of the compound is clamped a bearing block5, having a lateral, bifurcated base 6, which straddles the tool post 4,and is provided on its under side with a rib or tongue 7, which lies inthe T-slot 3, and prevents a twisting moverectangular in form, and isprovided with I a longitudinal slideway 12, which extends in from theface of the block a distance equal to about half its thickness, and theopposing faces of the slideway are slightly inclined towards eachother,-so that the width of the slideway increases slightly from theface of the block, inward. Back of the slideway the block is formed witha central recess 13, the back wall ofwhich has an axial hole whichextends out through the hub 10. A shaft 14, is mounted in the hub 10,the inner end of which carries a bevel gear wheel 15, which lies in therecess 13, of the block, and the outer end of this shaft carries asheave wheel 16, which is connected with a power source in a manner tobe presently described. A slide bar 17, is mounted in the slideway 12,its parallel edges being beveled or inclined to correspond to theinclined faces of the slideway, and a shim 18, is interposed between theupper edge of the slide bar and the adjacent face of the slideway, andis held against the slide bar by screws 19, as shown.

parts.

. gitudinal slipping movement.

The shim is adjusted to take up wear between the bar and slideway, thusmaintaining a proper sliding fit between the This slide bar is providedwith a longitudinal slot 20, which extends to within a short distance ofeach end of the bar, and on one end of the bar is formed a semicircularextension 21, to the free endof which is hinged a substantiallysemicircular arm 22, the free end of which is bifurcated and normallrests on the adjacent end portion 23, o the slide bar, this portion ofthe bar being narrower than the remainder of the bar, as shown in Figure4. .A stud 24, is screwed into the upper edge of this narrow portion 23,and extends through the bifurcated end of the arm 22, when the latter isclosed, and a thumb nut 25, is screwed upon the stud and against thebifurcated end of the arm 22, thereb holding the arm in closed position.A rib 26, is formed on the under side ofthe free end of the arm 22,which fits in a groove or recess 27, in the adjoining edge of the barand holds the arm securely against a lon- The parts 22 and 23, togetherform a ring-like head A, through which the crank pins or the axialportions of a crank shaft extend when undergoing regrinding, and each ofthe parts 22, and 23, is formed with a laterally projecting lug 28, ineach of which is formed an axial hole 29, which also extends through theparts 22, and 23, respectively; the parts of the holes extending throughthe lugs being threaded, while the remainder of each hole is unthreaded.Into the unthreaded parts of the holes 29, are inserted the shanks ofV-shaped clamps 30, which lie within the head A, and thumb screws 31,are screwed into the lugs and against the ends of the shanks of theclamps 30, to clamp them upon the crank pin or the axial portion, as thecase may be, of a crank shaft,

as will hereinafter more fully appear. A raised portion 32, is formed onthe guide block 11, on one side of the recess 13 and this raised portionhas a semicircular bearing, in which rests the hub 33, of a bevel pinion34, which meshes with the bevel gear 15, the pinion being held in placeby a cap 35, which is fastened to the raised part 32, by screws as shownin Figures 4 and 6.

The end ofthe pinion hub 33, is flanged, as shown at 36, to preventendwise movement of the pinion in its bearings. A shaft 37, extendslongitudinally through the slide bar and beyond each end of the same,this shaft passing axially through the pinion 34, and its hub. The shaftis formed with a longitudinal groove 38, and the wall of I the bore ofthe pinion hub is provided with a spline 39, which fits in the groove38, thereby turning the shaft 37, with the pmadjacent end portion of theshaft 37. The

end portion of the shaft extending beyond the bearing 42, is threaded,and either a grinding or a cutting wheel may be screwed thereon. If agrinding wheel is employed, it may be a flat faced emery wheel 43,having a nut 44, embedded in its rear face which is screwed upon the endof the shaft; or it may be a similar wheel 45, one-half of the face ofwhich is beveled or inclined, as shown at 46, so as to be out ofengagement with the surface being ground, thus presenting a semicirculargrinding face, by which the frictional resistance between the wheel andthe surface being ground is greatly reduced. If a cutting or millingwheel is desired, a common type of wheel'47, such as shown in Figure 11,may be employed. The opposite end portion of the shaft 37, passesthrough a common form of micrometer gauge M, comprising a tubular member48, which is screwed into the adjacent end of the slide bar, the shaftpassing through the same; an elongated hollow nut 49, which is threadedto the member 48; a flanged bushing 50, which surrounds the shaft andextends through the end wall of the nut, and a member 51, which isscrewed upon the projecting portion of the bushing, a screw 52, beingpassed through the part 51, and the bushing 50, and into one of a seriesof notches 53, on the shaft, thereby rigidly securing the parts 50 and'51, to the shaft. Anti-friction ,balls are interposed between theflange of the bushing and the adjacent face of the end wall of the nut;between the outer end of the nut and the member 51, and between thebushing and the margin of the hole in the end of the nut, through whichthe said bushing passes. By turning the nut 49, on the part 48, theshaft 37, can be moved forward to cause the grindingwwheel to engage acrank pin or an axial portion, the part 48, and the nut 49, being formedwith cooperating graduation marks, which indicate the minutestadjustment of the shaft. The nut is held against accidental rotation bya spring 54, which is secured at one end to the part 48, its free endbearingfrictionally on the nut.

The crank shaft to be reground is supported in the usual chuck and tailstocks 5 and 5 of the lathe, and on the true center line of its axialportions, and the head A to be inserted in the head, and the arm 22,

' is then swung back and clamped in place by the nut 25. The said pin isthen clamped between the V-shaped clamps 30, so that the axis of the pinmay-be 'in line with the axis of the shaft 37, or slightly above orbelow the axis of the shaft 37 as conditions may warrant, and thisposition of the pin with respect to head A, and the axis of the shaft37, is maintained by 'the clamps 30, throughoutthe regrinding of thepin.

The bevel gear 15, may be operated by belting the sheave wheel 16, to awheel ona power shaft, apart from and above the lathe but we preferablysupport both the grinding machine and its driving belts and pulleystogether. with the operating motor, directly upon the lathe, and in thefollowing manner:

Upon the rear side of the carriage 1, are bolted a pair of standards 55,which are curved slightly towards the front side of the carriage. In theup er ends of these standards is mounted a s aft 56, upon which ismounted a horizontally disposed bar 57 upon one end of which issecured-an electric motor X, adapted to be connected with a currentsource, in the usual manner. The opposite end of this bar carries a stubshaft 58, upon which are mounted a pair of sheave pulleys 59 and 60. Thepulley 59, is connected by a belt 61, with a sheave pulley 62, rigidlymounted on the shaft 56, and which is preferably of greater diameterthan the pulley 59; and the pulley 60, is connected by a belt 63, withthe sheave wheel 16. The shaft 56, also has a sheave pulley 64, which isconnected by a belt 65, with a sheave pulley 66, on the motor shaft, andpower is thus transmitted from the motor to the hotel gear wheel 15,through the belts and pulleys above described. The relative diameters ofthe pulleys 62 and-59, and of the pulleys 60 and 16, may be such as togive the required speed to the shaft 37, for the purpose intended. Theweight of the motor, on one end of the bar 57, is sufiicient to hold thebelt 63 under the necessary tension, and when the said belt is removedfrom the wheel 16, the motor will tilt the bar 57, until it rests upon across bar 55, which is secured to the standards 55, thus supporting theweight of the 'motor.

In operation, the crank shaft is supported in the lathe, and the headend of the slide bar 17 is secured, say, upon one of the crank pins, inthe manner before described. The grinder is then adjusted by themicrometer to engage the pin, and the motor is started. The crank shaftis turned upon its axis at a relatively slow speed, and the slide bar isthereby slid back and forth in the guide block 11, a distancecorresponding to the throw of the crank, and at the same time the guideblock is rocked in its bearing in the block 5. The gear wheel 15,imparts a very rapid rotation to the bevel pinion 34, which in turnimparts its rotation to-the grinding shaft 37, by means of the spline39, which slides in the groove 38, of the shaft 37, as the slide barreciprocates in the block 11, through its connection with the crank pinto which it is connected by the V-clamps 30. The grinder is fed againstthe crank pin by the micrometer, until the necessary amount of thesurface of the pin has been removed, to correct any irregularity orunevenness therein, and as the crank shaft turns on its true axialcenter, and the axis of the guide bar maintains the same positionrelatively to the axis of the pin throughout the grinding operation, itwill be seen that when reground the surface of the pin will not only belevel throughout, but concentric, round and true with its axis, thelathe carriage bein adjusted to move the grinder over the w ole lengthof the pin.

The operation for regrinding or cutting the shaft is the same as inregrinding or cutting the crank pins, only that when the shaft portionsare reground or cut, the slide bar remains stationaryin the slide block11, which in turn remains stationary in its bearing block 5.

Having described our invention, what we claim as new and desire tosecure by Letters Patent, is:

1. In a machine for regrinding crank shafts, the combination with meansfor-supporting and turning a crank shaft on its axis, of a bar capableof a reciprocating movement having a ring-like head on one end adaptedto loosely surround a crank pin of said shaft and means for connectingsaid head to said pin to revolve therewith, an adjustable rotatablegrinding element on said' bar for engaging said in, and power drivenmeans for rotating said grinding element.

2. In a machine of the character described, the combination with meansfor supporting and turning a crank shaft on its axis, of a bar capableof a reciprocating movement,

means operated thereby for transmitting rotation to said grinding means.v 3. In a machine ofthe character described, the combination with meansfor supporting and turning a crank shaft on its axis, of a pivotedsupport, a bar slidably mounted therein having a ring-like head on oneend adapted to loosely surround a crank pin of said shaft, and clampingelements in said head to secure the same to the crank pin to revolvetherewith, a grinding element carried by said bar to engage said pin,means for adjusting said grinding element, and power driven meanscarried by the -pivoted support for operating the grinding element.

4. In a machine of the character described, the combination with meansfor supporting and turning a crank shaft on its axis, of a pivotedsupport, a bar slidably mounted in said support having a ring-like headon one end adapted to loosely surround a crank pin of said shaft, andmeans for securin said head to said pin to revolve therewit anadjustable shaft mounted in said bar having a grinding element thereonfor engaging said pin, a pinion wheel on said pivoted support throughwhich said shaft extends slidably but not rotatably, and a power-drivengear wheel also mounted in said pivoted support in mesh with saidpinion.

5. In a machine of the character described, the combination with meansfor supporting and turninga crank shaft on its axis, of a pivotedsupport, a bar slidably mounted therein having a member adapted tosurround a crank in of said shaft and clamps in said member for securingthe same to the crank pin to revolve therewith, a bevel pinion mountedon said pivoted support, a longitudinally adjustable shaft hav ing alongitudinal groove, mounted in said slidable bar and extending slidablythrough said pinion, a spline in said pinion which enters said groove,and a power-driven bevel gear also mounted in said pivoted support,which meshes with said bevel pinion.

6. In a machine of the character described, the combina'tion with meansfor supporting and turning a crank shaft on its axis, of a pivotedsupport, a bar slidably mounted therein, a grinding element mounted insaid bar and power-driven gearing mounted on said pivoted support forrotating said grinding elerrfent,'a ring-like head on one end of saidslide bar, having a hinged section which is opened to permit said headto receive a crank pin of said crank shaft, means for locking saidhinged section in closed position, adjustable clamps in said head forengaging said crank pin and maintaining a fixed relation between saidhead and said crank pin during the revolutions of said pin, and meansfor moving said grind in element into contact with said pin. a

In a machine of the character described, the combination with means forsupporting and turning a crank shaft on its axis, of a support, a guideblock pivoted to said support, a power-driven bevel gear axially mountedin said guide block, a bevel pinion mounted on said guide block in meshwith said gear having-an apertured hub and a spline therein; alongitudinally slotted tudinal groove to receive said spline where I bysaid shaft is rotated by said pinion, a

grinding element on the forward end of said shaft, a ring-head on theforward end of the slide bar, having a hinged section which is opened topermit the insertion of a crank pin in said head, means for locking thesection in closed position, adjustable means in said head for engagingsaid crank pin whereby said head is revolved with said pin, and meansfor adjusting said shaft longitudinally to cause said grinding elementto engage said pin, said pinion extending into the slot in said slidebar.

8. In a machine of the character described, the combination with meansfor supporting and turning a crank shaft on its axis, and an adjustablemember having a movement at right angles to the axis of the shaft, of asupport on said adjustable member, a guide block in pivoted engagementwith the support, a bar slidably mounted in said guide block and adaptedto be secured at one end upon a pin of said crank shaft to turntherewith, a rotatable grinder mount ed in said bar, means for adjustingthe same with respect to the crank pin, and powerdriven gearingsupported in said guide blockfor rotating said grinder.

9. The combination of means for supporting and turning a crank shaft onits axis, a support, a guide block pivotally mounted in the support, alongitudinally slotted bar slidably mounted in the guide block, a shaftaxially mounted in said guide block, having a gear wheel on one end anda belt wheel on the other end, a pinion 'mounted on said block in meshwith said gear, a shaft extending slidably but non-rotatably throughsaid pinion, and mounted in the ends of said slide bar, a grinding wheelon the forward end of said shaft, an integral ring head on the forwardend of the slide bar adapted to surround a pin of said crank shaft andmeans in said head for holding the same upon said pin to turn with thesame, a micrometer gauge connected to said shaft and to said slide bar,for adjusting said shaft to cause said-grinding wheel to engage saidcrank pin, anda power-driven belt for engaging said belt wheel, saidpin-' ion extending into the slot in said slide bar.

10. The combination with a lathe for sup porting and turning a crankshaft on its axis, a carriage on said lathe and an adjustable member onthe carriage having a movement thereon at right angles to that of thecarriage, of a bearing block rigidly secured to the latter member, aguide b ock having a hub pivotally mounted in the bearing block, a shaftmounted in said hub having a pulley on one end and a bevel gear on theother, standards on the carriage and a shaft mounted in the upper endsofthe standards, a bar pivotally mounted on the shaft having a motor onone end and a pulley on the other end and a belt connecting the samewith the first mentioned pulley; belts and pulleys for transmitting therotative power of the motor to the pulley on the end of the arm, alongitudinally slotted bar slidably mounted in the guide block, a bevelpinion on the guide block in mesh with the bevel gear, and extendinginto the slot in the slide bar, a rod mounted in said slide bar, andextending slidably through said bevel pinion, but adapted to rotate thesame, a grinder on the forward end of the shaft, means for connectingthe forward end of the slide bar. to

" a crank pin of said crank shaft to turn therewith, and means foradjusting said rod to cause said grinder to engage the crank pin. 11. Ina machine of the character described,

the combination with means for supporting said head, and means fornormally clampand turning a crank shaft, of means adapted to beconnected at one end to a crank pin of said shaft, and having a rotarygrinder, means for adjusting said rotary grinder with respect to thecrank pin, means for supporting the grinder, carrying means to permit areciprocating movement of the same and means for rotatin said grinder.

12. In a machine of t e character described, a longitudinally slottedbar, a pivotally mounted guide block in which said bar is slidablmounted, a ring-like head on one end 0 said bar having a hinged sectionwhich can be swung back to leave an .opening in the ringhead and meansfor holding said section in a closed position, a bevel pinion mounted onsaid guide block and ex tending, into the slot in the slide bar, agrooved shaft extending slidably through said bevel pinion and mountedin the ends of said bar and a spline in said pinion for engaging thegroove in said shaft, a flat faced grlnder-on the end of said shaft within said ring head, an abutment on the other end portion of said shaft, atubular member on the adjacent end of said slide bar, surrounding saidshaft, a nut threaded to said tubular member and connected to saidabutment for imparting longitudinal adjust ment to said shaft, a bevelgear mounted in said guide block in mesh with said pinion, and meanswhereby said gear wheel may be rotated in combination with means.

for supporting and turninga crank shaft on its axis, V-clamps in saidhead for engaging a crank pin, and thumb screws for holding said clampsin engagement withsaid pin, whereby said slide bar moves with said pinand properly positions the grinder with respect to the pin, a fixedrelation being maintained between the axis of said shaft and the axis ofthe crank pin.

, 13. In a machine of the character described, a bar capable of areciprocating movement, a longitudinally adjustable shaft in said bar, agrinder on the forward end of said shaft and means for impartingrotation to said shaft, a ring-like head on the forward end of said barhaving a hinged section which can be thrown back to open ing the freeend of said section'against the adjacent end portion of said bar, andadjustable clamps in said head whereby said head may be clamped upon thepin of a crank shaft axially mounted in operative relation to said slidebar, to properly position said grinder with respect to said pin.

' 14. In a machine of the character described, the combination withlongitudinally slotted slide bar and a shaft extending through said slotand through the end portions of said bar and having a grinder thereon,of a bearing in the forward end of said bar, comprising an internallyand externallfy threaded sleeve, and a. bushing for said sha t which isthreaded to said sleeve.

In testimony whereof we afiix'our signa tures in presence of twowitnesses.

FRANK H. PETERSEN. JAMES H DARLING.

